Parse csv data and convert to nested json java

Question

I\'m searching for simplest way or any jar available to read csv file in java and convert to into nested json. I tried searching for various sources, but all the places i co

Answer 1

You can use JackSon to convert CSV to JSON. For example see the following code:

import java.io.File;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.csv.CsvMapper;
import com.fasterxml.jackson.dataformat.csv.CsvSchema;

public class CSV2JSON {

    public static void main(String[] args) throws Exception {
        File input = new File("input.csv");
        File output = new File("output.json");

        CsvSchema csvSchema = CsvSchema.builder().setUseHeader(true).build();
        CsvMapper csvMapper = new CsvMapper();

        // Read data from CSV file
        List<object> readAll = csvMapper.readerFor(Map.class).with(csvSchema).readValues(input).readAll();

        ObjectMapper mapper = new ObjectMapper();

        // Write JSON formated data to output.json file
        mapper.writerWithDefaultPrettyPrinter().writeValue(output, readAll);

        // Write JSON formated data to stdout
        System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(readAll));
    }
}

If you are using maven you can add the Jackson dependency as following:

   <dependency>
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-databind</artifactId>
     <version>2.8.9</version>
   </dependency>
   <dependency>
     <groupId>com.fasterxml.jackson.dataformat</groupId>
     <artifactId>jackson-dataformat-csv</artifactId>
     <version>2.8.9</version>
   </dependency>